Doosan D20S-5 Operation & Maintenance Manual page 88

Operation Section Operation Section
Basic Troubleshooting(LP) Basic Troubleshooting(LP)
The MI-07 systems are equipped with built-in fault The MI-07 systems are equipped with built-in fault
diagnostics. diagnostics.
displayed by the Malfunction Indicator Lamp (MIL) displayed by the Malfunction Indicator Lamp (MIL)
and are covered in the Advanced Diagnostics and are covered in the Advanced Diagnostics
section. section. Items such as Items
lines, clogged fuel filters and malfunctioning lines, clogged fuel filters and malfunctioning
pressure regulators may not set a fault code by the pressure regulators may not set a fault code by the
Small Engine Control Module (SECM). Below are Small Engine Control Module (SECM). Below are
Problem Problem
Engine Cranking Engine Cranking
but Will Not Start but Will Not Start
Detected system Detected system faults faults can
such as fuel fuel level, level, plugged f plugged fuel
Probable Cause Probable Cause
Fuel container Fuel container empty
Liquid valve Liquid valve closed closed
Excess flow Excess flow valve valve closed
Plugged fuel Plugged fuel line line
Broken Broken Fuse Fuse - - SECM
Clogged Clogged fuel fuel filter filter
Faulty vapor connection between Faulty vapor connection between
the the pressure pressure
and the mixer and the mixer
Fuel Fuel Lock-off Lock-off malfunction malfunction
Pressure Pressure
malfunction malfunction
Incorrect air/fuel or ignition/spark Incorrect air/fuel or ignition/spark
control control
No No VR VR Sensor Sensor Signal
-85- -85-
basic checks that should be made before referring basic checks that should be made before referring
can be be to the Advanced Diagnostics section, if engine or to the Advanced Diagnostics section, if engine or
drivability problems are encountered. drivability problems are encountered.
uel Locating a problem in a propane engine is done Locating a problem in a propane engine is done
exactly the same way as with a gasoline engine. exactly the same way as with a gasoline engine.
Consider all parts of the ignition and mechanical Consider all parts of the ignition and mechanical
systems as well as the fuel system. systems as well as the fuel system.
Corrective Action Corrective
empty Fill fuel Fill
Slowly open Slowly
closed Reset excess Reset
Remove obstruction Remove
SECM Replace Replace Fuse
Repair/replace as Repair/replace
Check connection Check connection
regulator/converter regulator/converter
Repair/replace Repair/re
regulator/converter regulator/converter Test pressure regulator/conv Test pressure r
See Advanced Diagnostics See Advanced Diagnostics
Signal Verify the Verify
Action
fuel container container
Do Do not not exceed exceed 80% of 80% of
 
capacity capacity
open liquid liquid valve valve
excess flow flow valve valve
Close liquid valve Close liquid valve
 
Wait for a "click" sound Wait for a "click" sound
 
Slowly open liquid valve Slowly open liquid valve
 
obstruction from from the the fuel
Close liquid fuel valve Close liquid fuel valve
 
Using caution, disconnect the fuel Using caution, disconnect the fuel
 
line (some propane may escape) line (some propane may escape)
Clear obstruction with compressed Clear obstruction with compressed
 
air air
Re-connect fuel line Re-connect fuel line
 
Slowly open liquid fuel valve Slowly open liquid fuel valve
 
Leak test Leak test
 
Fuse for for SECM SECM
See Maintenance Section, Fuses See Maintenance Section, Fuses
 
replacement replacement
as required required
See Maintenance Section, LP Fuel See Maintenance Section, LP Fuel
 
Filter Filter replacement replacement
Verify no holes in hose Verify no holes in hose
 
Clamps must be tight Clamps must be tight
 
Look for kinked, pinched and/or Look for kinked, pinched and/or
 
collapsed hose collapsed hose
place Fuel Fuel Lock-off Lock-off
See Engine Service Manual See Engine Service Manual
 
egulator/converter o erter operation
See Engine Service Manual See Engine Service Manual
 
the VR VR signal signal is is present present
See Advanced Diagnostics See Advanced Diagnostics
 
liquid liquid
fuel line line
peration